/*
2021-7-17
https://ac.nowcoder.com/acm/contest/11166/B 
*/

#include <cmath>
#include <iostream>

using namespace std;

double r, a, b, h;
double x, ans;

int main() {
	scanf("%lf%lf%lf%lf", &r, &a, &b, &h);
	
	if (2 * r < b) puts("Drop");
	else {
		x = (double)h * b / (a - b);
		ans = (double)2 * r * sqrt(x * x + b * b / 4) / b - x;
		puts("Stuck");
		printf("%.10lf\n", ans);
	}
	
	return 0;
}
